Aiming at the difficulty and high precision of electronic injector control,in order to further improve the accuracy of fuel injection,a new type of high pressure common-rail injector fuel distribution valve was proposed.And the flow field characteristic of the valve port was simulated.The structure and working principle of the rotary valve were introduced.Based on the working parameters of the JE4D25A diesel engine,the key dimensions of the valve port were obtained through theoretical calculations,and the physical model of the valve channel fluid domain was established.The basin models with 11.5°,23° and 34.5°spool rotation angles were simulated in Fluent software.The flow characteristics of the fluid at the valve port were obtained.After analysis,at idle speed and rated speed,the single oil distribution volume is 0.059 mL and 0.078 mL respectively,and the output flow at rated speed is 6.8% more than theoretical calculation,which provides a reference for subsequent valve port size optimization.